New shape for better fit and styling 11 vents so cool heads always prevail Bonus decal sheet 2 sets of sizing pads Meet Occident Standards(CE/CPSC) Color:As the picture shows Please select from the drop down list above. Outer Material:ABS Advanced Engineering Plastic(Plating) Mesochite Material:Black EPS(High-density Foa) Inner Material:High-density Foam Fabric(Soft and Comfortable) Size:M(fits for the people whose head size is under 58cm ) Ways to measure head size:Grab a seamstress tape and measure the circumfrence of your head or your childfrom the forehead hariy root to the occiput protrusion.